Eighteen-year-old Ning Yue is the last student of Xiling Sword Academy. His family is in a tight financial situation, and his sister's tuition is also burdened on his shoulders. In a monthly test, he was defeated by three quick sword moves, but the ancestral black wooden sword box lit up with silver light after the broken blade was put into the box: it will only leave an outline of the opponent's flaw after the holder is truly defeated, and only one can always be retained. From this, Ning Yue began to take the initiative to challenge powerful enemies with different styles, but soon discovered that copying the flaws would only lead to falling into new traps. As the quota for the only state college in the annual sword competition approached, Zhou Ye, the top student in the college, saw through his learning style and began to deliberately change his rhythm and block opportunities to practice. Ning Yue must learn to distinguish clues and answers from victory and defeat in the arena, and must also get rid of the dangerous habit of "seeing more if you take more hits". The broken blade is getting shorter and shorter, and the sword box lights up and goes silent again and again. What he really wants to catch up with is no longer just an opponent, but a sword that does not rely on failure to think for itself.
